CVE-2024-45678

MEDIUM

YubiKey 5 Series < 5.7.0 and YubiHSM 2 < 2.4.0 - ECDSA Secret-Key Extraction via Electromagnetic Side Channel

Title source: llm

Description

Yubico YubiKey 5 Series devices with firmware before 5.7.0 and YubiHSM 2 devices with firmware before 2.4.0 allow an ECDSA secret-key extraction attack (that requires physical access and expensive equipment) in which an electromagnetic side channel is present because of a non-constant-time modular inversion for the Extended Euclidean Algorithm, aka the EUCLEAK issue. Other uses of an Infineon cryptographic library may also be affected.

References (6)

Core 6

Core References

Press/Media Coverage

https://arstechnica.com/security/2024/09/yubikeys-are-vulnerable-to-cloning-attacks-thanks-to-newly-discovered-side-channel/

Issue Tracking

https://news.ycombinator.com/item?id=41434500

Third Party Advisory

https://ninjalab.io/eucleak/

Technical Description

https://ninjalab.io/wp-content/uploads/2024/09/20240903_eucleak.pdf

Mitigation, Third Party Advisory

https://support.yubico.com/hc/en-us/articles/15705749884444

Vendor Advisory

https://www.yubico.com/support/security-advisories/ysa-2024-03/

Scores

CVSS v3 4.2

EPSS 0.0033

EPSS Percentile 24.5%

Attack Vector PHYSICAL

CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-203

Status published

Products (18)

yubico/security_key_c_nfc_by_yubico_firmware < 5.7

yubico/security_key_nfc_by_yubico_firmware < 5.7

yubico/yubihsm_2_fips_firmware < 2.4.0

yubico/yubihsm_2_firmware < 2.4.0

yubico/yubikey_5_nano_fips_firmware < 5.7

yubico/yubikey_5_nano_firmware < 5.7

yubico/yubikey_5_nfc_fips_firmware < 5.7

yubico/yubikey_5_nfc_firmware < 5.7

yubico/yubikey_5c_fips_firmware < 5.7

yubico/yubikey_5c_firmware < 5.7

... and 8 more

Published Sep 03, 2024

Tracked Since Feb 18, 2026